C. S. Akondi
A5007078765- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Atomic and Subatomic Physics Research
- Nuclear physics research studies
- Advanced NMR Techniques and Applications
- Particle Accelerators and Free-Electron Lasers
- Dark Matter and Cosmic Phenomena
- Nuclear Physics and Applications
- Atomic and Molecular Physics
- Quantum, superfluid, helium dynamics
- Medical Imaging Techniques and Applications
- Superconducting Materials and Applications
- Particle accelerators and beam dynamics
- Particle Detector Development and Performance
- Photonic and Optical Devices
- Radiation Detection and Scintillator Technologies
- Advancements in Photolithography Techniques
- Radiation Therapy and Dosimetry
- Algebraic and Geometric Analysis
- Cold Fusion and Nuclear Reactions
- Astrophysics and Cosmic Phenomena
Kent State University
2014-2024
Florida State University
2020-2024
We report the total and differential cross sections for $J/\psi$ photoproduction with large acceptance GlueX spectrometer photon beam energies from threshold at 8.2~GeV up to 11.44~GeV over full kinematic range of momentum transfer squared, $t$. Such coverage facilitates extrapolation forward ($t = 0$) point beyond physical region. The section is used by many theoretical models plays an important role in understanding its relation $J/\psi-$proton interaction. These measurements near are also...
This document presents the initial scientific case for upgrading Continuous Electron Beam Accelerator Facility (CEBAF) at Jefferson Lab (JLab) to 22 GeV. It is result of a community effort, incorporating insights from series workshops conducted between March 2022 and April 2023. With track record over 25 years in delivering world's most intense precise multi-GeV electron beams, CEBAF's potential higher energy upgrade unique opportunity an innovative nuclear physics program, which seamlessly...
The reactions γp→ηp and γp→η^{'}p are measured from their thresholds up to the center-of-mass energy W=1.96 GeV with tagged-photon facilities at Mainz Microtron, MAMI. Differential cross sections obtained unprecedented statistical accuracy, providing fine binning full production-angle coverage. A strong cusp is observed in total section for η photoproduction energies vicinity of η^{'} threshold, W=1896 MeV (E_{γ}=1447 MeV). Within framework a revised ηMAID isobar model, cusp, connection...
The spin polarizabilities of the nucleon describe how responds to an incident polarized photon. most model-independent way extract is through Compton scattering. Double-polarized scattering asymmetries on proton were measured in $\mathrm{\ensuremath{\Delta}}(1232)$ region using circularly photons and a transversely target at Mainz Microtron. Fits asymmetry data performed dispersion model calculation baryon chiral perturbation theory calculation, separation all four multipole basis was...
Differential cross sections for the gamma p -> pi^0 reaction have been measured with A2 tagged-photon facilities at Mainz Microtron, MAMI C, up to center-of-mass energy W=1.9 GeV. The new results, obtained a fine and angular binning, increase existing quantity of photoproduction data by ~47%. Owing unprecedented statistical accuracy full coverage, results are sensitive high partial-wave amplitudes. This is demonstrated decomposition differential in terms Legendre polynomials further...
We present new data for the transverse target asymmetry T and very first beam-target F in →γ→p→ηp reaction up to a center-of-mass energy of W=1.9 GeV. The were obtained with Crystal-Ball/TAPS detector setup at Glasgow tagged photon facility Mainz Microtron MAMI. All existing model predictions fail reproduce indicating significant impact on our understanding underlying dynamics η meson photoproduction. peculiar nodal structure observed close threshold is not confirmed.Received 12 June...
We measure for the first time differential photoproduction cross section $d\sigma/dt$ of $a_2(1320)$ meson at an average photon beam energy 8.5~GeV, using data with integrated luminosity 104~pb$^{-1}$ collected by GlueX experiment. fully reconstruct $\gamma p \to \eta\pi^0 p$ reaction and perform a partial-wave analysis in mass region amplitudes that incorporate linear polarization beam. This allows us to separate contributions natural- unnatural-parity exchanges. These measurements provide...
We report on the results of first search for production axion-like particles (ALPs) via Primakoff nuclear targets, γA→aA, in "SRC-CT" experiment using GlueX detector at Jefferson Lab. This uses an integrated luminosity 100 pb⋅−1nucleon a 12C target with real photon beam energies 6<Eγ<10.8 GeV, and explores mass region 200<ma<450 MeV decay a→γγ. range is between π0 η meson masses, which enables use measured rate to obtain absolute bounds ALP reduced sensitivity experimental detection...
The Dalitz decay π0→e+e−γ has been measured in the γp→π0p reaction with A2 tagged-photon facility at Mainz Microtron, MAMI. value obtained for slope parameter of π0 electromagnetic transition form factor, aπ=0.030±0.010tot, is agreement existing measurements this and recent theoretical calculations. uncertainty aπ lower than previous results based on decay.Received 16 November 2016DOI:https://doi.org/10.1103/PhysRevC.95.025202©2017 American Physical SocietyPhysics Subject Headings...
The $\ensuremath{\gamma}n\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}n$ differential cross section evaluated for 27 energy bins span the photon-energy range 290--813 MeV ($W=1.195$--1.553 GeV) and pion c.m. polar production angles, ranging from ${18}^{\ensuremath{\circ}}$ to ${162}^{\ensuremath{\circ}}$, making use of model-dependent nuclear corrections extract ${\ensuremath{\pi}}^{0}$ data on neutron measurements deuteron target. Additionally, total photoabsorption was measured. tagged...
We present a search for axionlike particles, $a$, produced in photon-proton collisions at center-of-mass energy of approximately 4 GeV, focusing on the scenario where $a$-gluon coupling is dominant. The uses $a\ensuremath{\rightarrow}\ensuremath{\gamma}\ensuremath{\gamma}$ and $a\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$ decays, data sample corresponding to an integrated luminosity $168\text{ }\text{...
Precise helicity-dependent cross sections and the double-polarization observable $E$ were measured for $\ensuremath{\eta}$ photoproduction from quasifree protons neutrons bound in deuteron. The $\ensuremath{\eta}\ensuremath{\rightarrow}2\ensuremath{\gamma}$ $\ensuremath{\eta}\ensuremath{\rightarrow}3{\ensuremath{\pi}}^{0}\ensuremath{\rightarrow}6\ensuremath{\gamma}$ decay modes used to optimize statistical quality of data estimate systematic uncertainties. measurement A2 detector setup at...
The double-polarization observable $E$ and the helicity-dependent cross sections $\sigma_{1/2}$ $\sigma_{3/2}$ have been measured for first time single $\pi^{0}$ photoproduction from protons neutrons bound in deuteron at electron accelerator facility MAMI Mainz, Germany. experiment used a circularly polarized photon beam longitudinally deuterated butanol target. reaction products, recoil nucleons decay photons $\pi^0$ meson were detected with Crystal Ball TAPS electromagnetic calorimeters....
This work measured $d\sigma/d\Omega$ for neutral kaon photoproduction reactions from threshold up to a c.m.\ energy of 1855MeV, focussing specifically on the $\gamma p\rightarrow K^0\Sigma^+$, n\rightarrow K^0\Lambda$, and K^0 \Sigma^0$ reactions. Our results are first-ever measurements that reaction. These data will provide insight into properties $N^*$ resonances and, in particular, lead an improved knowledge about those states couple only weakly $\pi N$ channel. Integrated cross sections...
Polarisation-dependent differential cross sections σT associated with the target asymmetry T have been measured for reaction γp→→pπ0 transverse polarisation from π0 threshold to photon energies of 190 MeV. The data were obtained using a frozen-spin butanol Crystal Ball / TAPS detector set-up and Glasgow tagging system at Mainz Microtron MAMI. Results used in combination our previous measurements unpolarised section σ0 beam Σ model-independent determination S- P-wave multipoles region, which...
We report a measurement of the spin polarisation recoiling neutron in deuterium photodisintegration, utilising new large acceptance polarimeter within Crystal Ball at MAMI. The measured photon energy range 300~--~700~MeV provides first recoil energies where quark substructure deuteron plays role, thereby providing important constraints on photodisintegration mechanisms. A very high narrow structure centred around $E_{\gamma}\sim$~570~MeV is observed, which inconsistent with current...
The GlueX experiment at Jefferson Lab studies photoproduction of mesons using linearly polarized 8.5GeV photons impinging on a hydrogen target which is contained within detector with near-complete coverage for charged and neutral particles. We present measurements spin-density matrix elements the vector meson ρ(770). statistical precision achieved exceeds that previous experiments in this energy range by orders magnitude. confirm high degree s-channel helicity conservation small squared...
The Compton double-polarization observable ${\mathrm{\ensuremath{\Sigma}}}_{2z}$ has been measured for the first time in $\mathrm{\ensuremath{\Delta}}(1232)$ resonance region using a circularly polarized photon beam incident on longitudinally proton target at Mainz Microtron. This paper reports these results, together with model-dependent extraction of four spin polarizabilities from fits to additional asymmetry data either dispersion relation calculation or baryon chiral perturbation theory...
We report the first large-acceptance measurement of beam-spin asymmetry for deuteron photodisintegration ($\vec{\gamma} d\to pn$) in photon energy range $400<E_{\gamma}<630$~MeV. The provides important new constraints on mechanisms above delta resonance and photocoupling recently discovered $d^*(2380)$ hexaquark.
We report on the measurement of spin density matrix elements $\mathrm{\ensuremath{\Lambda}}(1520)$ in photoproduction reaction $\ensuremath{\gamma}p\ensuremath{\rightarrow}\mathrm{\ensuremath{\Lambda}}(1520){K}^{+}$, via its subsequent decay to ${K}^{\ensuremath{-}}p$. The was performed as part GlueX experimental program Hall D at Jefferson Laboratory using a linearly polarized photon beam with...
The spin-exotic hybrid meson π1(1600) is predicted to have a large decay rate the ωππ final state. Using 76.6 pb−1 of data collected with GlueX detector, we measure cross sections for reactions γp→ωπ+π−p, γp→ωπ0π0p, and γp→ωπ−π0Δ++ in range Eγ=8–10 GeV. isospin conservation, set first upper limits on photoproduction π10(1600) π1−(1600). We combine these lattice calculations widths find that η′π most sensitive two-body system search π1(1600). locked icon Physics Subject Headings...